Fig. 6.

Ternary complex of Bet v 1a with ANS and kinetin. Ligands bound in the ternary complex are shown in yellow. For comparison, ligands from binary complexes are shown in pink (ANS) and blue (kinetin). (a) Overall view of Bet v 1a with ANS and kinetin bound in the hydrophobic core. (b) Superposition of ANS and kinetin as bound in the respective binary complexes (cf., Fig. 4b and c) results in overlapping binding modes. For clarity, only kinetin conformation A is shown. (c) Close-up view of ANS and kinetin bound simultaneously to Bet v 1a. ANS is coordinated similar to the binary complex. Thus, the presence of ANS in the cavity displaces kinetin to a secondary binding site. (d) Comparison of kinetin coordination in the binary and ternary complex. The furan ring was located at the same site, indicating a role as anchor for kinetin in the cavity.